bug#63757: 29.0.91 order of package paths changed: random old versions of packages in load-path

[Eli Zaretskii]

> From: Philip Kaludercic <philipk@posteo.net>
> Cc: Евгений Бойков <artscan@list.ru>,
>   monnier@iro.umontreal.ca,
>   63757@debbugs.gnu.org
> Date: Sun, 04 Jun 2023 09:17:46 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > So you are saying that other people mostly delete old versions from
> > ~/.emacs.d/elpa/, and that's why this problem was not reported until
> > now, is that right?
> 
> If you use regular package-* functions, upgrading always deletes and old
> version when the new one is installed, so IIRC having two separate
> versions of a package installed has to be the result of some manual
> intervention.
> 
> > What are our recommendations, if any, for cleaning up old versions of
> > ELPA packages?
> 
> M-x package-autoremove should take care of them.

So maybe we don't have to fix this on the emacs-29 branch, but can
instead install the changes on master?  And maybe consider backporting
them later for Emacs 29.2?